Adding-machine provided with chain drive.



. B. BEER. ADDING MACHINE PROVIDED WITH CHAIN DRIVE.

APPLICATION FILED AUG. 30, 1911.

Patented May 12, 1914.

oubuoo W a l UNITED STATES PATENT OFFICE.

BERNHARD BEHR, OF DRESDEN, GERMANY.

ADDING-MACHINE PROVIDED WITH CHAIN DRIVE.

To all whom it may concern Be it known that I, BERNIIARD BEHR, of 19Hamburgerstrasse, Dresden, in the Kingdom of Saxony, in the GermanEmpire, company director, have invented certain new and usefulImprovements in Adding- Machines Provided with Chain Drive.

This invention relates to an adding machine provided with chain drive,according to which those parts of the chain which operate the figuredisk consist of members having springoperated pawls or of a collapsibleand spring-operated rack. By this arrangement the advantages of anadding machine provided with rack driving mechanism are combined in asingle machine with those of a machine having a chain drive.

In the constructional form of the machine in which the operating part ofthe machine consists of a collapsible spring-operated rack, it isnecessary to mount the rack on parallel arms, which are normally in aninclined position, for the purpose of avoiding the dead point betweenthe driving tooth and the tooth to be engaged. In this manner theefliciency is substantially increased, and it is possible simultaneouslyto operate a large number of tens without any trouble, which in therestricted method generally employed is in many cases impossible.

In the accompanying drawing Figure 1 is a longitudinal section of theadding machine, omitting irrelevant parts; Fig. 2 is a section on theline wm of Fig. 1; Fig. 3 is a section through the guiding plate for thechains; Fig. 4 shows the part of the chain above the guiding plate to alarger scale, the chain consisting of operating members, figure disks,and the rod-like parts of the chain connecting these two together; Fig.5 is a plan of the same part of the chain; Fig. 6 is a section on theline g -g through one of the operating members; Fig. 7 is a section onthe line zz through the flat connecting rod between the operating andfigure members; Fig. 8 shows a constructional form in which the part ofthe chain corresponding to the operating members is replaced by acollapsible operating rod.

The machine between the two guiding rollers c for the chain iscompletely covered by the plate 9. Above the surface of the plate 9 thechains are provided and are guided in separate guides by guiding groovesbeing milled in the plate 9 so that Specification of Letters Patent.

Application filed August 30, 1911.

Patented May 12, 1914.

Serial No. 646,899.

on both sides guides are formed. The chains consist of separate parts,which are each adapted for a certain operation. One part corresponds tothe figure disks m. The part connected thereto is formed by the flat rod2), the next part is formed by the operating part 7} having foldingpawls. To these are connected the usual chain members (Z, the lastmember of which is connected by a spring 0 to the end of the row a ofoperating members. The spring 0 tensions the chain. As the chain onlymoves through a distance equal to the part on provided with the numbers,the chain therefore reciprocates; the connecting member between themembers for the figures and the operating members, which moves in astraight line from one guiding roller 0 to the other, can consequentlybe replaced by a flat rod 79. The chain members m provided with figureslie on one another in the manner of tiles and form eyes for inserting apin by means of which the chains can be adjusted. The looking members a,with which locking teeth provided on a shaft engage in the usual manner,are released on depression of the releasing key, so that the chain isagain brought into the original position by the action of the spring f.The part to the left of the rod 7) is formed by the operating members 7these are provided with springoperated pawls 1*. Each separate operatingmember consists of a frame in which are rotatably mounted thespring-operated pawls r in such manner that on the movement of the chainto the right the pawls operate the figure disks Z), but on releasing thechain, that is, on the return movement, they pass over the figure disksas the rotatable pawls are folded on their pivots (see Fig. at).

According to the constructional form shown in Fig. 8, the operatingmembers are replaced by a rack 25, which in arms to forming aparallelogram can be folded on the rod 8. A spring '0 raises the rack twhen the chain is moved to the right, so that the figure disk Z) isoperated, whereby a projection .2 provided behind one of the arms 20prevents the arms to from assuming a vertical position. On the movementof the chain to the left the rack t is depressed and the teeth are putout of operation. On the employment of a rack instead of a chain havingtoothed members, the machine is somewhat longer, but behind the figuredisk suflicient space remains free for the movement of the tens. Byplacing the parallelogram formed by the rods 8 and racks t and the arms'10 in an inclined position the dead point between the engaging toothand the 5 tooth to be driven is avoided whereby the simultaneousmovement of a large number of tens can be effected smoothly.

Having now particularly described and ascertained the nature of my saidinvention, 10 and in What manner the same is to be per formed, I declarethat What I claim is In combination with a toothed figure or like wheelof a calculating machine, a reciprotating, chain composed of linkspivotally 15 connected with each other, rollers about Copies of thispatent may be obtained for five cents each, by addressing theGommissioner of Iatents,

Washington, 1). O.

